Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 VERSION = 5
   3 PATCHLEVEL = 2
   4 SUBLEVEL = 16
   5 EXTRAVERSION =
   6 NAME = Bobtail Squid
   7
   8 # *DOCUMENTATION*
   9 # To see a list of typical targets execute "make help"
  10 # More info can be located in ./README
  11 # Comments in this file are targeted only to the developer, do not
  12 # expect to learn how to build the kernel reading this file.
  13
  14 # That's our default target when none is given on the command line
  15 PHONY := _all
  16 _all:
  17
  18 # We are using a recursive build, so we need to do a little thinking
  19 # to get the ordering right.
  20 #
  21 # Most importantly: sub-Makefiles should only ever modify files in
  22 # their own directory. If in some directory we have a dependency on
  23 # a file in another dir (which doesn't happen often, but it's often
  24 # unavoidable when linking the built-in.a targets which finally
  25 # turn into vmlinux), we will call a sub make in that other dir, and
  26 # after that we are sure that everything which is in that other dir
  27 # is now up to date.
  28 #
  29 # The only cases where we need to modify files which have global
  30 # effects are thus separated out and done before the recursive
  31 # descending is started. They are now explicitly listed as the
  32 # prepare rule.
  33
  34 ifneq ($(sub_make_done),1)
  35
  36 # Do not use make's built-in rules and variables
  37 # (this increases performance and avoids hard-to-debug behaviour)
  38 MAKEFLAGS += -rR
  39
  40 # Avoid funny character set dependencies
  41 unexport LC_ALL
  42 LC_COLLATE=C
  43 LC_NUMERIC=C
  44 export LC_COLLATE LC_NUMERIC
  45
  46 # Avoid interference with shell env settings
  47 unexport GREP_OPTIONS
  48
  49 # Beautify output
  50 # ---------------------------------------------------------------------------
  51 #
  52 # Normally, we echo the whole command before executing it. By making
  53 # that echo $($(quiet)$(cmd)), we now have the possibility to set
  54 # $(quiet) to choose other forms of output instead, e.g.
  55 #
  56 #         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  57 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
  58 #
  59 # If $(quiet) is empty, the whole command will be printed.
  60 # If it is set to "quiet_", only the short version will be printed.
  61 # If it is set to "silent_", nothing will be printed at all, since
  62 # the variable $(silent_cmd_cc_o_c) doesn't exist.
  63 #
  64 # A simple variant is to prefix commands with $(Q) - that's useful
  65 # for commands that shall be hidden in non-verbose mode.
  66 #
  67 #       $(Q)ln $@ :<
  68 #
  69 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  70 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  71 #
  72 # To put more focus on warnings, be less verbose as default
  73 # Use 'make V=1' to see the full commands
  74
  75 ifeq ("$(origin V)", "command line")
  76   KBUILD_VERBOSE = $(V)
  77 endif
  78 ifndef KBUILD_VERBOSE
  79   KBUILD_VERBOSE = 0
  80 endif
  81
  82 ifeq ($(KBUILD_VERBOSE),1)
  83   quiet =
  84   Q =
  85 else
  86   quiet=quiet_
  87   Q = @
  88 endif
  89
  90 # If the user is running make -s (silent mode), suppress echoing of
  91 # commands
  92
  93 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  94   quiet=silent_
  95 endif
  96
  97 export quiet Q KBUILD_VERBOSE
  98
  99 # Kbuild will save output files in the current working directory.
 100 # This does not need to match to the root of the kernel source tree.
 101 #
 102 # For example, you can do this:
 103 #
 104 #  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
 105 #
 106 # If you want to save output files in a different location, there are
 107 # two syntaxes to specify it.
 108 #
 109 # 1) O=
 110 # Use "make O=dir/to/store/output/files/"
 111 #
 112 # 2) Set KBUILD_OUTPUT
 113 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
 114 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
 115 #
 116 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
 117 # variable.
 118
 119 # Do we want to change the working directory?
 120 ifeq ("$(origin O)", "command line")
 121   KBUILD_OUTPUT := $(O)
 122 endif
 123
 124 ifneq ($(KBUILD_OUTPUT),)
 125 # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
 126 # expand a shell special character '~'. We use a somewhat tedious way here.
 127 abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
 128 $(if $(abs_objtree),, \
 129      $(error failed to create output directory "$(KBUILD_OUTPUT)"))
 130
 131 # $(realpath ...) resolves symlinks
 132 abs_objtree := $(realpath $(abs_objtree))
 133 else
 134 abs_objtree := $(CURDIR)
 135 endif # ifneq ($(KBUILD_OUTPUT),)
 136
 137 ifeq ($(abs_objtree),$(CURDIR))
 138 # Suppress "Entering directory ..." unless we are changing the work directory.
 139 MAKEFLAGS += --no-print-directory
 140 else
 141 need-sub-make := 1
 142 endif
 143
 144 abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 145
 146 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
 147 $(error source directory cannot contain spaces or colons)
 148 endif
 149
 150 ifneq ($(abs_srctree),$(abs_objtree))
 151 # Look for make include files relative to root of kernel src
 152 #
 153 # This does not become effective immediately because MAKEFLAGS is re-parsed
 154 # once after the Makefile is read. We need to invoke sub-make.
 155 MAKEFLAGS += --include-dir=$(abs_srctree)
 156 need-sub-make := 1
 157 endif
 158
 159 ifneq ($(filter 3.%,$(MAKE_VERSION)),)
 160 # 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
 161 # We need to invoke sub-make to avoid implicit rules in the top Makefile.
 162 need-sub-make := 1
 163 # Cancel implicit rules for this Makefile.
 164 $(lastword $(MAKEFILE_LIST)): ;
 165 endif
 166
 167 export abs_srctree abs_objtree
 168 export sub_make_done := 1
 169
 170 ifeq ($(need-sub-make),1)
 171
 172 PHONY += $(MAKECMDGOALS) sub-make
 173
 174 $(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
 175         @:
 176
 177 # Invoke a second make in the output directory, passing relevant variables
 178 sub-make:
 179         $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 180
 181 endif # need-sub-make
 182 endif # sub_make_done
 183
 184 # We process the rest of the Makefile if this is the final invocation of make
 185 ifeq ($(need-sub-make),)
 186
 187 # Do not print "Entering directory ...",
 188 # but we want to display it when entering to the output directory
 189 # so that IDEs/editors are able to understand relative filenames.
 190 MAKEFLAGS += --no-print-directory
 191
 192 # Call a source code checker (by default, "sparse") as part of the
 193 # C compilation.
 194 #
 195 # Use 'make C=1' to enable checking of only re-compiled files.
 196 # Use 'make C=2' to enable checking of *all* source files, regardless
 197 # of whether they are re-compiled or not.
 198 #
 199 # See the file "Documentation/dev-tools/sparse.rst" for more details,
 200 # including where to get the "sparse" utility.
 201
 202 ifeq ("$(origin C)", "command line")
 203   KBUILD_CHECKSRC = $(C)
 204 endif
 205 ifndef KBUILD_CHECKSRC
 206   KBUILD_CHECKSRC = 0
 207 endif
 208
 209 # Use make M=dir to specify directory of external module to build
 210 # Old syntax make ... SUBDIRS=$PWD is still supported
 211 # Setting the environment variable KBUILD_EXTMOD take precedence
 212 ifdef SUBDIRS
 213   $(warning ================= WARNING ================)
 214   $(warning 'SUBDIRS' will be removed after Linux 5.3)
 215   $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
 216   $(warning ==========================================)
 217   KBUILD_EXTMOD ?= $(SUBDIRS)
 218 endif
 219
 220 ifeq ("$(origin M)", "command line")
 221   KBUILD_EXTMOD := $(M)
 222 endif
 223
 224 ifeq ($(abs_srctree),$(abs_objtree))
 225         # building in the source tree
 226         srctree := .
 227 else
 228         ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
 229                 # building in a subdirectory of the source tree
 230                 srctree := ..
 231         else
 232                 srctree := $(abs_srctree)
 233         endif
 234
 235         # TODO:
 236         # KBUILD_SRC is only used to distinguish in-tree/out-of-tree build.
 237         # Replace it with $(srctree) or something.
 238         KBUILD_SRC := $(abs_srctree)
 239 endif
 240
 241 export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
 242
 243 objtree         := .
 244 src             := $(srctree)
 245 obj             := $(objtree)
 246
 247 VPATH           := $(srctree)
 248
 249 export srctree objtree VPATH
 250
 251 # To make sure we do not include .config for any of the *config targets
 252 # catch them early, and hand them over to scripts/kconfig/Makefile
 253 # It is allowed to specify more targets when calling make, including
 254 # mixing *config targets and build targets.
 255 # For example 'make oldconfig all'.
 256 # Detect when mixed targets is specified, and make a second invocation
 257 # of make so .config is not included in this case either (for *config).
 258
 259 version_h := include/generated/uapi/linux/version.h
 260 old_version_h := include/linux/version.h
 261
 262 clean-targets := %clean mrproper cleandocs
 263 no-dot-config-targets := $(clean-targets) \
 264                          cscope gtags TAGS tags help% %docs check% coccicheck \
 265                          $(version_h) headers_% archheaders archscripts \
 266                          %asm-generic kernelversion %src-pkg
 267 no-sync-config-targets := $(no-dot-config-targets) install %install \
 268                            kernelrelease
 269
 270 config-targets  := 0
 271 mixed-targets   := 0
 272 dot-config      := 1
 273 may-sync-config := 1
 274
 275 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
 276         ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
 277                 dot-config := 0
 278         endif
 279 endif
 280
 281 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
 282         ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
 283                 may-sync-config := 0
 284         endif
 285 endif
 286
 287 ifneq ($(KBUILD_EXTMOD),)
 288         may-sync-config := 0
 289 endif
 290
 291 ifeq ($(KBUILD_EXTMOD),)
 292         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
 293                 config-targets := 1
 294                 ifneq ($(words $(MAKECMDGOALS)),1)
 295                         mixed-targets := 1
 296                 endif
 297         endif
 298 endif
 299
 300 # For "make -j clean all", "make -j mrproper defconfig all", etc.
 301 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
 302         ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
 303                 mixed-targets := 1
 304         endif
 305 endif
 306
 307 # install and modules_install need also be processed one by one
 308 ifneq ($(filter install,$(MAKECMDGOALS)),)
 309         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
 310                 mixed-targets := 1
 311         endif
 312 endif
 313
 314 ifeq ($(mixed-targets),1)
 315 # ===========================================================================
 316 # We're called with mixed targets (*config and build targets).
 317 # Handle them one by one.
 318
 319 PHONY += $(MAKECMDGOALS) __build_one_by_one
 320
 321 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
 322         @:
 323
 324 __build_one_by_one:
 325         $(Q)set -e; \
 326         for i in $(MAKECMDGOALS); do \
 327                 $(MAKE) -f $(srctree)/Makefile $$i; \
 328         done
 329
 330 else
 331
 332 include scripts/Kbuild.include
 333
 334 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 335 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 336 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
 337 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
 338
 339 include scripts/subarch.include
 340
 341 # Cross compiling and selecting different set of gcc/bin-utils
 342 # ---------------------------------------------------------------------------
 343 #
 344 # When performing cross compilation for other architectures ARCH shall be set
 345 # to the target architecture. (See arch/* for the possibilities).
 346 # ARCH can be set during invocation of make:
 347 # make ARCH=ia64
 348 # Another way is to have ARCH set in the environment.
 349 # The default ARCH is the host where make is executed.
 350
 351 # CROSS_COMPILE specify the prefix used for all executables used
 352 # during compilation. Only gcc and related bin-utils executables
 353 # are prefixed with $(CROSS_COMPILE).
 354 # CROSS_COMPILE can be set on the command line
 355 # make CROSS_COMPILE=ia64-linux-
 356 # Alternatively CROSS_COMPILE can be set in the environment.
 357 # Default value for CROSS_COMPILE is not to prefix executables
 358 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
 359 ARCH            ?= $(SUBARCH)
 360
 361 # Architecture as present in compile.h
 362 UTS_MACHINE     := $(ARCH)
 363 SRCARCH         := $(ARCH)
 364
 365 # Additional ARCH settings for x86
 366 ifeq ($(ARCH),i386)
 367         SRCARCH := x86
 368 endif
 369 ifeq ($(ARCH),x86_64)
 370         SRCARCH := x86
 371 endif
 372
 373 # Additional ARCH settings for sparc
 374 ifeq ($(ARCH),sparc32)
 375        SRCARCH := sparc
 376 endif
 377 ifeq ($(ARCH),sparc64)
 378        SRCARCH := sparc
 379 endif
 380
 381 # Additional ARCH settings for sh
 382 ifeq ($(ARCH),sh64)
 383        SRCARCH := sh
 384 endif
 385
 386 KCONFIG_CONFIG  ?= .config
 387 export KCONFIG_CONFIG
 388
 389 # SHELL used by kbuild
 390 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 391           else if [ -x /bin/bash ]; then echo /bin/bash; \
 392           else echo sh; fi ; fi)
 393
 394 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 395 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
 396 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
 397
 398 HOSTCC       = gcc
 399 HOSTCXX      = g++
 400 KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
 401                 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
 402                 $(HOSTCFLAGS)
 403 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 404 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 405 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 406
 407 # Make variables (CC, etc...)
 408 AS              = $(CROSS_COMPILE)as
 409 LD              = $(CROSS_COMPILE)ld
 410 CC              = $(CROSS_COMPILE)gcc
 411 CPP             = $(CC) -E
 412 AR              = $(CROSS_COMPILE)ar
 413 NM              = $(CROSS_COMPILE)nm
 414 STRIP           = $(CROSS_COMPILE)strip
 415 OBJCOPY         = $(CROSS_COMPILE)objcopy
 416 OBJDUMP         = $(CROSS_COMPILE)objdump
 417 PAHOLE          = pahole
 418 LEX             = flex
 419 YACC            = bison
 420 AWK             = awk
 421 INSTALLKERNEL  := installkernel
 422 DEPMOD          = /sbin/depmod
 423 PERL            = perl
 424 PYTHON          = python
 425 PYTHON2         = python2
 426 PYTHON3         = python3
 427 CHECK           = sparse
 428
 429 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 430                   -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
 431 NOSTDINC_FLAGS :=
 432 CFLAGS_MODULE   =
 433 AFLAGS_MODULE   =
 434 LDFLAGS_MODULE  =
 435 CFLAGS_KERNEL   =
 436 AFLAGS_KERNEL   =
 437 LDFLAGS_vmlinux =
 438
 439 # Use USERINCLUDE when you must reference the UAPI directories only.
 440 USERINCLUDE    := \
 441                 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
 442                 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
 443                 -I$(srctree)/include/uapi \
 444                 -I$(objtree)/include/generated/uapi \
 445                 -include $(srctree)/include/linux/kconfig.h
 446
 447 # Use LINUXINCLUDE when you must reference the include/ directory.
 448 # Needed to be compatible with the O= option
 449 LINUXINCLUDE    := \
 450                 -I$(srctree)/arch/$(SRCARCH)/include \
 451                 -I$(objtree)/arch/$(SRCARCH)/include/generated \
 452                 $(if $(filter .,$(srctree)),,-I$(srctree)/include) \
 453                 -I$(objtree)/include \
 454                 $(USERINCLUDE)
 455
 456 KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 457 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 458                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 459                    -Werror=implicit-function-declaration -Werror=implicit-int \
 460                    -Wno-format-security \
 461                    -std=gnu89
 462 KBUILD_CPPFLAGS := -D__KERNEL__
 463 KBUILD_AFLAGS_KERNEL :=
 464 KBUILD_CFLAGS_KERNEL :=
 465 KBUILD_AFLAGS_MODULE  := -DMODULE
 466 KBUILD_CFLAGS_MODULE  := -DMODULE
 467 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
 468 KBUILD_LDFLAGS :=
 469 GCC_PLUGINS_CFLAGS :=
 470 CLANG_FLAGS :=
 471
 472 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 473 export CPP AR NM STRIP OBJCOPY OBJDUMP PAHOLE KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 474 export MAKE LEX YACC AWK INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 475 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 476
 477 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 478 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 479 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 480 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 481 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 482 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
 483 export KBUILD_ARFLAGS
 484
 485 # When compiling out-of-tree modules, put MODVERDIR in the module
 486 # tree rather than in the kernel tree. The kernel tree might
 487 # even be read-only.
 488 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
 489
 490 # Files to ignore in find ... statements
 491
 492 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
 493                           -name CVS -o -name .pc -o -name .hg -o -name .git \) \
 494                           -prune -o
 495 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
 496                          --exclude CVS --exclude .pc --exclude .hg --exclude .git
 497
 498 # ===========================================================================
 499 # Rules shared between *config targets and build targets
 500
 501 # Basic helpers built in scripts/basic/
 502 PHONY += scripts_basic
 503 scripts_basic:
 504         $(Q)$(MAKE) $(build)=scripts/basic
 505         $(Q)rm -f .tmp_quiet_recordmcount
 506
 507 PHONY += outputmakefile
 508 # outputmakefile generates a Makefile in the output directory, if using a
 509 # separate output directory. This allows convenient use of make in the
 510 # output directory.
 511 # At the same time when output Makefile generated, generate .gitignore to
 512 # ignore whole output directory
 513 outputmakefile:
 514 ifneq ($(srctree),.)
 515         $(Q)ln -fsn $(srctree) source
 516         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
 517         $(Q)test -e .gitignore || \
 518         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 519 endif
 520
 521 ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
 522 ifneq ($(CROSS_COMPILE),)
 523 CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
 524 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
 525 CLANG_FLAGS     += --prefix=$(GCC_TOOLCHAIN_DIR)
 526 GCC_TOOLCHAIN   := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
 527 endif
 528 ifneq ($(GCC_TOOLCHAIN),)
 529 CLANG_FLAGS     += --gcc-toolchain=$(GCC_TOOLCHAIN)
 530 endif
 531 CLANG_FLAGS     += -no-integrated-as
 532 CLANG_FLAGS     += -Werror=unknown-warning-option
 533 KBUILD_CFLAGS   += $(CLANG_FLAGS)
 534 KBUILD_AFLAGS   += $(CLANG_FLAGS)
 535 export CLANG_FLAGS
 536 endif
 537
 538 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
 539 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
 540 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
 541 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
 542 CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
 543
 544 ifeq ($(config-targets),1)
 545 # ===========================================================================
 546 # *config targets only - make sure prerequisites are updated, and descend
 547 # in scripts/kconfig to make the *config target
 548
 549 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
 550 # KBUILD_DEFCONFIG may point out an alternative default configuration
 551 # used for 'make defconfig'
 552 include arch/$(SRCARCH)/Makefile
 553 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
 554
 555 config: scripts_basic outputmakefile FORCE
 556         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 557
 558 %config: scripts_basic outputmakefile FORCE
 559         $(Q)$(MAKE) $(build)=scripts/kconfig $@
 560
 561 else
 562 # ===========================================================================
 563 # Build targets only - this includes vmlinux, arch specific targets, clean
 564 # targets and others. In general all targets except *config targets.
 565
 566 # If building an external module we do not care about the all: rule
 567 # but instead _all depend on modules
 568 PHONY += all
 569 ifeq ($(KBUILD_EXTMOD),)
 570 _all: all
 571 else
 572 _all: modules
 573 endif
 574
 575 # Decide whether to build built-in, modular, or both.
 576 # Normally, just do built-in.
 577
 578 KBUILD_MODULES :=
 579 KBUILD_BUILTIN := 1
 580
 581 # If we have only "make modules", don't compile built-in objects.
 582 # When we're building modules with modversions, we need to consider
 583 # the built-in objects during the descend as well, in order to
 584 # make sure the checksums are up to date before we record them.
 585
 586 ifeq ($(MAKECMDGOALS),modules)
 587   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
 588 endif
 589
 590 # If we have "make <whatever> modules", compile modules
 591 # in addition to whatever we do anyway.
 592 # Just "make" or "make all" shall build modules as well
 593
 594 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
 595   KBUILD_MODULES := 1
 596 endif
 597
 598 ifeq ($(MAKECMDGOALS),)
 599   KBUILD_MODULES := 1
 600 endif
 601
 602 export KBUILD_MODULES KBUILD_BUILTIN
 603
 604 ifeq ($(dot-config),1)
 605 include include/config/auto.conf
 606 endif
 607
 608 ifeq ($(KBUILD_EXTMOD),)
 609 # Objects we will link into vmlinux / subdirs we need to visit
 610 init-y          := init/
 611 drivers-y       := drivers/ sound/
 612 drivers-$(CONFIG_SAMPLES) += samples/
 613 net-y           := net/
 614 libs-y          := lib/
 615 core-y          := usr/
 616 virt-y          := virt/
 617 endif # KBUILD_EXTMOD
 618
 619 # The all: target is the default when no target is given on the
 620 # command line.
 621 # This allow a user to issue only 'make' to build a kernel including modules
 622 # Defaults to vmlinux, but the arch makefile usually adds further targets
 623 all: vmlinux
 624
 625 CFLAGS_GCOV     := -fprofile-arcs -ftest-coverage \
 626         $(call cc-option,-fno-tree-loop-im) \
 627         $(call cc-disable-warning,maybe-uninitialized,)
 628 export CFLAGS_GCOV
 629
 630 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
 631 ifdef CONFIG_FUNCTION_TRACER
 632   CC_FLAGS_FTRACE := -pg
 633 endif
 634
 635 RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
 636 RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
 637 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 638 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 639 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
 640 RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
 641 export RETPOLINE_CFLAGS
 642 export RETPOLINE_VDSO_CFLAGS
 643
 644 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 645 # values of the respective KBUILD_* variables
 646 ARCH_CPPFLAGS :=
 647 ARCH_AFLAGS :=
 648 ARCH_CFLAGS :=
 649 include arch/$(SRCARCH)/Makefile
 650
 651 ifeq ($(dot-config),1)
 652 ifeq ($(may-sync-config),1)
 653 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
 654 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
 655 # because some architectures define CROSS_COMPILE there.
 656 include include/config/auto.conf.cmd
 657
 658 $(KCONFIG_CONFIG):
 659         @echo >&2 '***'
 660         @echo >&2 '*** Configuration file "$@" not found!'
 661         @echo >&2 '***'
 662         @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
 663         @echo >&2 '*** "make menuconfig" or "make xconfig").'
 664         @echo >&2 '***'
 665         @/bin/false
 666
 667 # The actual configuration files used during the build are stored in
 668 # include/generated/ and include/config/. Update them if .config is newer than
 669 # include/config/auto.conf (which mirrors .config).
 670 #
 671 # This exploits the 'multi-target pattern rule' trick.
 672 # The syncconfig should be executed only once to make all the targets.
 673 %/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
 674         $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 675 else
 676 # External modules and some install targets need include/generated/autoconf.h
 677 # and include/config/auto.conf but do not care if they are up-to-date.
 678 # Use auto.conf to trigger the test
 679 PHONY += include/config/auto.conf
 680
 681 include/config/auto.conf:
 682         $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
 683         echo >&2;                                                       \
 684         echo >&2 "  ERROR: Kernel configuration is invalid.";           \
 685         echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
 686         echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
 687         echo >&2 ;                                                      \
 688         /bin/false)
 689
 690 endif # may-sync-config
 691 endif # $(dot-config)
 692
 693 KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
 694 KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
 695 KBUILD_CFLAGS   += $(call cc-disable-warning, format-truncation)
 696 KBUILD_CFLAGS   += $(call cc-disable-warning, format-overflow)
 697 KBUILD_CFLAGS   += $(call cc-disable-warning, address-of-packed-member)
 698
 699 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 700 KBUILD_CFLAGS   += -Os
 701 else
 702 KBUILD_CFLAGS   += -O2
 703 endif
 704
 705 ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
 706 KBUILD_CFLAGS   += -Wno-maybe-uninitialized
 707 endif
 708
 709 # Tell gcc to never replace conditional load with a non-conditional one
 710 KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
 711
 712 include scripts/Makefile.kcov
 713 include scripts/Makefile.gcc-plugins
 714
 715 ifdef CONFIG_READABLE_ASM
 716 # Disable optimizations that make assembler listings hard to read.
 717 # reorder blocks reorders the control in the function
 718 # ipa clone creates specialized cloned functions
 719 # partial inlining inlines only parts of functions
 720 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
 721                  $(call cc-option,-fno-ipa-cp-clone,) \
 722                  $(call cc-option,-fno-partial-inlining)
 723 endif
 724
 725 ifneq ($(CONFIG_FRAME_WARN),0)
 726 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
 727 endif
 728
 729 stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
 730 stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
 731 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 732
 733 KBUILD_CFLAGS += $(stackp-flags-y)
 734
 735 ifdef CONFIG_CC_IS_CLANG
 736 KBUILD_CPPFLAGS += -Qunused-arguments
 737 KBUILD_CFLAGS += -Wno-format-invalid-specifier
 738 KBUILD_CFLAGS += -Wno-gnu
 739 # Quiet clang warning: comparison of unsigned expression < 0 is always false
 740 KBUILD_CFLAGS += -Wno-tautological-compare
 741 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 742 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 743 # See modpost pattern 2
 744 KBUILD_CFLAGS += -mno-global-merge
 745 else
 746
 747 # These warnings generated too much noise in a regular build.
 748 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 749 KBUILD_CFLAGS += -Wno-unused-but-set-variable
 750 endif
 751
 752 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
 753 ifdef CONFIG_FRAME_POINTER
 754 KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
 755 else
 756 # Some targets (ARM with Thumb2, for example), can't be built with frame
 757 # pointers.  For those, we don't have FUNCTION_TRACER automatically
 758 # select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
 759 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
 760 # -fomit-frame-pointer with FUNCTION_TRACER.
 761 ifndef CONFIG_FUNCTION_TRACER
 762 KBUILD_CFLAGS   += -fomit-frame-pointer
 763 endif
 764 endif
 765
 766 # Initialize all stack variables with a pattern, if desired.
 767 ifdef CONFIG_INIT_STACK_ALL
 768 KBUILD_CFLAGS   += -ftrivial-auto-var-init=pattern
 769 endif
 770
 771 DEBUG_CFLAGS    := $(call cc-option, -fno-var-tracking-assignments)
 772
 773 ifdef CONFIG_DEBUG_INFO
 774 ifdef CONFIG_DEBUG_INFO_SPLIT
 775 DEBUG_CFLAGS    += -gsplit-dwarf
 776 else
 777 DEBUG_CFLAGS    += -g
 778 endif
 779 KBUILD_AFLAGS   += -Wa,-gdwarf-2
 780 endif
 781 ifdef CONFIG_DEBUG_INFO_DWARF4
 782 DEBUG_CFLAGS    += -gdwarf-4
 783 endif
 784
 785 ifdef CONFIG_DEBUG_INFO_REDUCED
 786 DEBUG_CFLAGS    += $(call cc-option, -femit-struct-debug-baseonly) \
 787                    $(call cc-option,-fno-var-tracking)
 788 endif
 789
 790 KBUILD_CFLAGS += $(DEBUG_CFLAGS)
 791 export DEBUG_CFLAGS
 792
 793 ifdef CONFIG_FUNCTION_TRACER
 794 ifdef CONFIG_FTRACE_MCOUNT_RECORD
 795   # gcc 5 supports generating the mcount tables directly
 796   ifeq ($(call cc-option-yn,-mrecord-mcount),y)
 797     CC_FLAGS_FTRACE     += -mrecord-mcount
 798     export CC_USING_RECORD_MCOUNT := 1
 799   endif
 800   ifdef CONFIG_HAVE_NOP_MCOUNT
 801     ifeq ($(call cc-option-yn, -mnop-mcount),y)
 802       CC_FLAGS_FTRACE   += -mnop-mcount
 803       CC_FLAGS_USING    += -DCC_USING_NOP_MCOUNT
 804     endif
 805   endif
 806 endif
 807 ifdef CONFIG_HAVE_FENTRY
 808   ifeq ($(call cc-option-yn, -mfentry),y)
 809     CC_FLAGS_FTRACE     += -mfentry
 810     CC_FLAGS_USING      += -DCC_USING_FENTRY
 811   endif
 812 endif
 813 export CC_FLAGS_FTRACE
 814 KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
 815 KBUILD_AFLAGS   += $(CC_FLAGS_USING)
 816 ifdef CONFIG_DYNAMIC_FTRACE
 817         ifdef CONFIG_HAVE_C_RECORDMCOUNT
 818                 BUILD_C_RECORDMCOUNT := y
 819                 export BUILD_C_RECORDMCOUNT
 820         endif
 821 endif
 822 endif
 823
 824 # We trigger additional mismatches with less inlining
 825 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 826 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
 827 endif
 828
 829 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 830 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
 831 LDFLAGS_vmlinux += --gc-sections
 832 endif
 833
 834 ifdef CONFIG_LIVEPATCH
 835 KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
 836 endif
 837
 838 # arch Makefile may override CC so keep this after arch Makefile is included
 839 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 840
 841 # warn about C99 declaration after statement
 842 KBUILD_CFLAGS += -Wdeclaration-after-statement
 843
 844 # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
 845 KBUILD_CFLAGS += -Wvla
 846
 847 # disable pointer signed / unsigned warnings in gcc 4.0
 848 KBUILD_CFLAGS += -Wno-pointer-sign
 849
 850 # disable stringop warnings in gcc 8+
 851 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 852
 853 # disable invalid "can't wrap" optimizations for signed / pointers
 854 KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
 855
 856 # clang sets -fmerge-all-constants by default as optimization, but this
 857 # is non-conforming behavior for C and in fact breaks the kernel, so we
 858 # need to disable it here generally.
 859 KBUILD_CFLAGS   += $(call cc-option,-fno-merge-all-constants)
 860
 861 # for gcc -fno-merge-all-constants disables everything, but it is fine
 862 # to have actual conforming behavior enabled.
 863 KBUILD_CFLAGS   += $(call cc-option,-fmerge-constants)
 864
 865 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
 866 KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
 867
 868 # conserve stack if available
 869 KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
 870
 871 # Prohibit date/time macros, which would make the build non-deterministic
 872 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 873
 874 # enforce correct pointer usage
 875 KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
 876
 877 # Require designated initializers for all marked structures
 878 KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
 879
 880 # change __FILE__ to the relative path from the srctree
 881 KBUILD_CFLAGS   += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
 882
 883 # use the deterministic mode of AR if available
 884 KBUILD_ARFLAGS := $(call ar-option,D)
 885
 886 include scripts/Makefile.kasan
 887 include scripts/Makefile.extrawarn
 888 include scripts/Makefile.ubsan
 889
 890 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
 891 # last assignments
 892 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
 893 KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
 894 KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
 895
 896 # Use --build-id when available.
 897 LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
 898 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 899 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 900
 901 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 902 LDFLAGS_vmlinux += $(call ld-option, -X,)
 903 endif
 904
 905 # insure the checker run with the right endianness
 906 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
 907
 908 # the checker needs the correct machine size
 909 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
 910
 911 # Default kernel image to build when no specific target is given.
 912 # KBUILD_IMAGE may be overruled on the command line or
 913 # set in the environment
 914 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
 915 # this default value
 916 export KBUILD_IMAGE ?= vmlinux
 917
 918 #
 919 # INSTALL_PATH specifies where to place the updated kernel and system map
 920 # images. Default is /boot, but you can set it to other values
 921 export  INSTALL_PATH ?= /boot
 922
 923 #
 924 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
 925 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
 926 # an argument if needed. Otherwise it defaults to the kernel install path
 927 #
 928 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
 929
 930 #
 931 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 932 # relocations required by build roots.  This is not defined in the
 933 # makefile but the argument can be passed to make if needed.
 934 #
 935
 936 MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
 937 export MODLIB
 938
 939 #
 940 # INSTALL_MOD_STRIP, if defined, will cause modules to be
 941 # stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
 942 # the default option --strip-debug will be used.  Otherwise,
 943 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
 944
 945 ifdef INSTALL_MOD_STRIP
 946 ifeq ($(INSTALL_MOD_STRIP),1)
 947 mod_strip_cmd = $(STRIP) --strip-debug
 948 else
 949 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
 950 endif # INSTALL_MOD_STRIP=1
 951 else
 952 mod_strip_cmd = true
 953 endif # INSTALL_MOD_STRIP
 954 export mod_strip_cmd
 955
 956 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
 957 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
 958 # or CONFIG_MODULE_COMPRESS_XZ.
 959
 960 mod_compress_cmd = true
 961 ifdef CONFIG_MODULE_COMPRESS
 962   ifdef CONFIG_MODULE_COMPRESS_GZIP
 963     mod_compress_cmd = gzip -n -f
 964   endif # CONFIG_MODULE_COMPRESS_GZIP
 965   ifdef CONFIG_MODULE_COMPRESS_XZ
 966     mod_compress_cmd = xz -f
 967   endif # CONFIG_MODULE_COMPRESS_XZ
 968 endif # CONFIG_MODULE_COMPRESS
 969 export mod_compress_cmd
 970
 971 ifdef CONFIG_MODULE_SIG_ALL
 972 $(eval $(call config_filename,MODULE_SIG_KEY))
 973
 974 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
 975 else
 976 mod_sign_cmd = true
 977 endif
 978 export mod_sign_cmd
 979
 980 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 981
 982 ifdef CONFIG_STACK_VALIDATION
 983   has_libelf := $(call try-run,\
 984                 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
 985   ifeq ($(has_libelf),1)
 986     objtool_target := tools/objtool FORCE
 987   else
 988     SKIP_STACK_VALIDATION := 1
 989     export SKIP_STACK_VALIDATION
 990   endif
 991 endif
 992
 993 PHONY += prepare0
 994
 995 ifeq ($(KBUILD_EXTMOD),)
 996 core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 997
 998 vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 999                      $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1000                      $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1001
1002 vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1003                      $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1004                         $(drivers-) $(net-) $(libs-) $(virt-))))
1005
1006 init-y          := $(patsubst %/, %/built-in.a, $(init-y))
1007 core-y          := $(patsubst %/, %/built-in.a, $(core-y))
1008 drivers-y       := $(patsubst %/, %/built-in.a, $(drivers-y))
1009 net-y           := $(patsubst %/, %/built-in.a, $(net-y))
1010 libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
1011 libs-y2         := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1012 virt-y          := $(patsubst %/, %/built-in.a, $(virt-y))
1013
1014 # Externally visible symbols (used by link-vmlinux.sh)
1015 export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1016                               $(drivers-y) $(net-y) $(virt-y)
1017 export KBUILD_VMLINUX_LIBS := $(libs-y1)
1018 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1019 export LDFLAGS_vmlinux
1020 # used by scripts/package/Makefile
1021 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1022
1023 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1024
1025 # Recurse until adjust_autoksyms.sh is satisfied
1026 PHONY += autoksyms_recursive
1027 autoksyms_recursive: $(vmlinux-deps)
1028 ifdef CONFIG_TRIM_UNUSED_KSYMS
1029         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1030           "$(MAKE) -f $(srctree)/Makefile vmlinux"
1031 endif
1032
1033 # For the kernel to actually contain only the needed exported symbols,
1034 # we have to build modules as well to determine what those symbols are.
1035 # (this can be evaluated only once include/config/auto.conf has been included)
1036 ifdef CONFIG_TRIM_UNUSED_KSYMS
1037   KBUILD_MODULES := 1
1038 endif
1039
1040 autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1041
1042 $(autoksyms_h):
1043         $(Q)mkdir -p $(dir $@)
1044         $(Q)touch $@
1045
1046 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1047
1048 # Final link of vmlinux with optional arch pass after final link
1049 cmd_link-vmlinux =                                                 \
1050         $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1051         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1052
1053 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1054         +$(call if_changed,link-vmlinux)
1055
1056 targets := vmlinux
1057
1058 # Some samples need headers_install.
1059 samples: headers_install
1060
1061 # The actual objects are generated when descending,
1062 # make sure no implicit rule kicks in
1063 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1064
1065 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1066 # Preset locale variables to speed up the build process. Limit locale
1067 # tweaks to this spot to avoid wrong language settings when running
1068 # make menuconfig etc.
1069 # Error messages still appears in the original language
1070
1071 PHONY += $(vmlinux-dirs)
1072 $(vmlinux-dirs): prepare
1073         $(Q)$(MAKE) $(build)=$@ need-builtin=1
1074
1075 filechk_kernel.release = \
1076         echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1077
1078 # Store (new) KERNELRELEASE string in include/config/kernel.release
1079 include/config/kernel.release: FORCE
1080         $(call filechk,kernel.release)
1081
1082 # Additional helpers built in scripts/
1083 # Carefully list dependencies so we do not try to build scripts twice
1084 # in parallel
1085 PHONY += scripts
1086 scripts: scripts_basic scripts_dtc
1087         $(Q)$(MAKE) $(build)=$(@)
1088
1089 # Things we need to do before we recursively start building the kernel
1090 # or the modules are listed in "prepare".
1091 # A multi level approach is used. prepareN is processed before prepareN-1.
1092 # archprepare is used in arch Makefiles and when processed asm symlink,
1093 # version.h and scripts_basic is processed / created.
1094
1095 PHONY += prepare archprepare prepare1 prepare3
1096
1097 # prepare3 is used to check if we are building in a separate output directory,
1098 # and if so do:
1099 # 1) Check that make has not been executed in the kernel src $(srctree)
1100 prepare3: include/config/kernel.release
1101 ifneq ($(srctree),.)
1102         @$(kecho) '  Using $(srctree) as source for kernel'
1103         $(Q)if [ -f $(srctree)/.config -o \
1104                  -d $(srctree)/include/config -o \
1105                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
1106                 echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1107                 echo >&2 "  in the '$(srctree)' directory.";\
1108                 /bin/false; \
1109         fi;
1110 endif
1111
1112 prepare1: prepare3 outputmakefile asm-generic $(version_h) $(autoksyms_h) \
1113                                                 include/generated/utsrelease.h
1114         $(cmd_crmodverdir)
1115
1116 archprepare: archheaders archscripts prepare1 scripts
1117
1118 prepare0: archprepare
1119         $(Q)$(MAKE) $(build)=scripts/mod
1120         $(Q)$(MAKE) $(build)=.
1121
1122 # All the preparing..
1123 prepare: prepare0 prepare-objtool
1124
1125 # Support for using generic headers in asm-generic
1126 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1127
1128 PHONY += asm-generic uapi-asm-generic
1129 asm-generic: uapi-asm-generic
1130         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1131         generic=include/asm-generic
1132 uapi-asm-generic:
1133         $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1134         generic=include/uapi/asm-generic
1135
1136 PHONY += prepare-objtool
1137 prepare-objtool: $(objtool_target)
1138 ifeq ($(SKIP_STACK_VALIDATION),1)
1139 ifdef CONFIG_UNWINDER_ORC
1140         @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1141         @false
1142 else
1143         @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1144 endif
1145 endif
1146
1147 # Generate some files
1148 # ---------------------------------------------------------------------------
1149
1150 # KERNELRELEASE can change from a few different places, meaning version.h
1151 # needs to be updated, so this check is forced on all builds
1152
1153 uts_len := 64
1154 define filechk_utsrelease.h
1155         if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1156           echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1157           exit 1;                                                         \
1158         fi;                                                               \
1159         echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1160 endef
1161
1162 define filechk_version.h
1163         echo \#define LINUX_VERSION_CODE $(shell                         \
1164         expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1165         echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1166 endef
1167
1168 $(version_h): FORCE
1169         $(call filechk,version.h)
1170         $(Q)rm -f $(old_version_h)
1171
1172 include/generated/utsrelease.h: include/config/kernel.release FORCE
1173         $(call filechk,utsrelease.h)
1174
1175 PHONY += headerdep
1176 headerdep:
1177         $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1178         $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1179
1180 # ---------------------------------------------------------------------------
1181 # Kernel headers
1182
1183 #Default location for installed headers
1184 export INSTALL_HDR_PATH = $(objtree)/usr
1185
1186 # If we do an all arch process set dst to include/arch-$(SRCARCH)
1187 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1188
1189 PHONY += archheaders archscripts
1190
1191 PHONY += __headers
1192 __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1193         $(Q)$(MAKE) $(build)=scripts build_unifdef
1194
1195 PHONY += headers_install_all
1196 headers_install_all:
1197         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1198
1199 PHONY += headers_install
1200 headers_install: __headers
1201         $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1202           $(error Headers not exportable for the $(SRCARCH) architecture))
1203         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1204         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1205
1206 PHONY += headers_check_all
1207 headers_check_all: headers_install_all
1208         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1209
1210 PHONY += headers_check
1211 headers_check: headers_install
1212         $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1213         $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1214
1215 ifdef CONFIG_HEADERS_CHECK
1216 all: headers_check
1217 endif
1218
1219 # ---------------------------------------------------------------------------
1220 # Kernel selftest
1221
1222 PHONY += kselftest
1223 kselftest:
1224         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1225
1226 PHONY += kselftest-clean
1227 kselftest-clean:
1228         $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1229
1230 PHONY += kselftest-merge
1231 kselftest-merge:
1232         $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1233         $(Q)find $(srctree)/tools/testing/selftests -name config | \
1234                 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1235         +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1236
1237 # ---------------------------------------------------------------------------
1238 # Devicetree files
1239
1240 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1241 dtstree := arch/$(SRCARCH)/boot/dts
1242 endif
1243
1244 ifneq ($(dtstree),)
1245
1246 %.dtb: prepare3 scripts_dtc
1247         $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1248
1249 PHONY += dtbs dtbs_install dt_binding_check
1250 dtbs dtbs_check: prepare3 scripts_dtc
1251         $(Q)$(MAKE) $(build)=$(dtstree)
1252
1253 dtbs_check: export CHECK_DTBS=1
1254 dtbs_check: dt_binding_check
1255
1256 dtbs_install:
1257         $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1258
1259 ifdef CONFIG_OF_EARLY_FLATTREE
1260 all: dtbs
1261 endif
1262
1263 endif
1264
1265 PHONY += scripts_dtc
1266 scripts_dtc: scripts_basic
1267         $(Q)$(MAKE) $(build)=scripts/dtc
1268
1269 dt_binding_check: scripts_dtc
1270         $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1271
1272 # ---------------------------------------------------------------------------
1273 # Modules
1274
1275 ifdef CONFIG_MODULES
1276
1277 # By default, build modules as well
1278
1279 all: modules
1280
1281 # Build modules
1282 #
1283 # A module can be listed more than once in obj-m resulting in
1284 # duplicate lines in modules.order files.  Those are removed
1285 # using awk while concatenating to the final file.
1286
1287 PHONY += modules
1288 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1289         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1290         @$(kecho) '  Building modules, stage 2.';
1291         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1292         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1293
1294 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1295         $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1296
1297 %/modules.builtin: include/config/auto.conf include/config/tristate.conf
1298         $(Q)$(MAKE) $(modbuiltin)=$*
1299
1300
1301 # Target to prepare building external modules
1302 PHONY += modules_prepare
1303 modules_prepare: prepare
1304
1305 # Target to install modules
1306 PHONY += modules_install
1307 modules_install: _modinst_ _modinst_post
1308
1309 PHONY += _modinst_
1310 _modinst_:
1311         @rm -rf $(MODLIB)/kernel
1312         @rm -f $(MODLIB)/source
1313         @mkdir -p $(MODLIB)/kernel
1314         @ln -s $(abspath $(srctree)) $(MODLIB)/source
1315         @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1316                 rm -f $(MODLIB)/build ; \
1317                 ln -s $(CURDIR) $(MODLIB)/build ; \
1318         fi
1319         @cp -f $(objtree)/modules.order $(MODLIB)/
1320         @cp -f $(objtree)/modules.builtin $(MODLIB)/
1321         @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1322         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1323
1324 # This depmod is only for convenience to give the initial
1325 # boot a modules.dep even before / is mounted read-write.  However the
1326 # boot script depmod is the master version.
1327 PHONY += _modinst_post
1328 _modinst_post: _modinst_
1329         $(call cmd,depmod)
1330
1331 ifeq ($(CONFIG_MODULE_SIG), y)
1332 PHONY += modules_sign
1333 modules_sign:
1334         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1335 endif
1336
1337 else # CONFIG_MODULES
1338
1339 # Modules not configured
1340 # ---------------------------------------------------------------------------
1341
1342 PHONY += modules modules_install
1343 modules modules_install:
1344         @echo >&2
1345         @echo >&2 "The present kernel configuration has modules disabled."
1346         @echo >&2 "Type 'make config' and enable loadable module support."
1347         @echo >&2 "Then build a kernel with module support enabled."
1348         @echo >&2
1349         @exit 1
1350
1351 endif # CONFIG_MODULES
1352
1353 ###
1354 # Cleaning is done on three levels.
1355 # make clean     Delete most generated files
1356 #                Leave enough to build external modules
1357 # make mrproper  Delete the current configuration, and all generated files
1358 # make distclean Remove editor backup files, patch leftover files and the like
1359
1360 # Directories & files removed with 'make clean'
1361 CLEAN_DIRS  += $(MODVERDIR) include/ksym
1362 CLEAN_FILES += modules.builtin.modinfo
1363
1364 # Directories & files removed with 'make mrproper'
1365 MRPROPER_DIRS  += include/config usr/include include/generated          \
1366                   arch/$(SRCARCH)/include/generated .tmp_objdiff
1367 MRPROPER_FILES += .config .config.old .version \
1368                   Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1369                   signing_key.pem signing_key.priv signing_key.x509     \
1370                   x509.genkey extra_certificates signing_key.x509.keyid \
1371                   signing_key.x509.signer vmlinux-gdb.py
1372
1373 # clean - Delete most, but leave enough to build external modules
1374 #
1375 clean: rm-dirs  := $(CLEAN_DIRS)
1376 clean: rm-files := $(CLEAN_FILES)
1377 clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs))
1378
1379 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1380 $(clean-dirs):
1381         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1382
1383 vmlinuxclean:
1384         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1385         $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1386
1387 clean: archclean vmlinuxclean
1388
1389 # mrproper - Delete all generated files, including .config
1390 #
1391 mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1392 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1393 mrproper-dirs      := $(addprefix _mrproper_,scripts)
1394
1395 PHONY += $(mrproper-dirs) mrproper
1396 $(mrproper-dirs):
1397         $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1398
1399 mrproper: clean $(mrproper-dirs)
1400         $(call cmd,rmdirs)
1401         $(call cmd,rmfiles)
1402
1403 # distclean
1404 #
1405 PHONY += distclean
1406
1407 distclean: mrproper
1408         @find $(srctree) $(RCS_FIND_IGNORE) \
1409                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1410                 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1411                 -o -name 'core' \) \
1412                 -type f -print | xargs rm -f
1413
1414
1415 # Packaging of the kernel to various formats
1416 # ---------------------------------------------------------------------------
1417 package-dir     := scripts/package
1418
1419 %src-pkg: FORCE
1420         $(Q)$(MAKE) $(build)=$(package-dir) $@
1421 %pkg: include/config/kernel.release FORCE
1422         $(Q)$(MAKE) $(build)=$(package-dir) $@
1423
1424
1425 # Brief documentation of the typical targets used
1426 # ---------------------------------------------------------------------------
1427
1428 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1429 boards := $(sort $(notdir $(boards)))
1430 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1431 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1432
1433 PHONY += help
1434 help:
1435         @echo  'Cleaning targets:'
1436         @echo  '  clean           - Remove most generated files but keep the config and'
1437         @echo  '                    enough build support to build external modules'
1438         @echo  '  mrproper        - Remove all generated files + config + various backup files'
1439         @echo  '  distclean       - mrproper + remove editor backup and patch files'
1440         @echo  ''
1441         @echo  'Configuration targets:'
1442         @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1443         @echo  ''
1444         @echo  'Other generic targets:'
1445         @echo  '  all             - Build all targets marked with [*]'
1446         @echo  '* vmlinux         - Build the bare kernel'
1447         @echo  '* modules         - Build all modules'
1448         @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1449         @echo  '  dir/            - Build all files in dir and below'
1450         @echo  '  dir/file.[ois]  - Build specified target only'
1451         @echo  '  dir/file.ll     - Build the LLVM assembly file'
1452         @echo  '                    (requires compiler support for LLVM assembly generation)'
1453         @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1454         @echo  '                    (requires a recent binutils and recent build (System.map))'
1455         @echo  '  dir/file.ko     - Build module including final link'
1456         @echo  '  modules_prepare - Set up for building external modules'
1457         @echo  '  tags/TAGS       - Generate tags file for editors'
1458         @echo  '  cscope          - Generate cscope index'
1459         @echo  '  gtags           - Generate GNU GLOBAL index'
1460         @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1461         @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1462         @echo  '  image_name      - Output the image name (use with make -s)'
1463         @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1464          echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1465          echo  ''
1466         @echo  'Static analysers:'
1467         @echo  '  checkstack      - Generate a list of stack hogs'
1468         @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1469         @echo  '  versioncheck    - Sanity check on version.h usage'
1470         @echo  '  includecheck    - Check for duplicate included header files'
1471         @echo  '  export_report   - List the usages of all exported symbols'
1472         @echo  '  headers_check   - Sanity check on exported headers'
1473         @echo  '  headerdep       - Detect inclusion cycles in headers'
1474         @echo  '  coccicheck      - Check with Coccinelle'
1475         @echo  ''
1476         @echo  'Kernel selftest:'
1477         @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1478         @echo  '                    Build, install, and boot kernel before'
1479         @echo  '                    running kselftest on it'
1480         @echo  '  kselftest-clean - Remove all generated kselftest files'
1481         @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1482         @echo  '                    .config.'
1483         @echo  ''
1484         @$(if $(dtstree), \
1485                 echo 'Devicetree:'; \
1486                 echo '* dtbs            - Build device tree blobs for enabled boards'; \
1487                 echo '  dtbs_install    - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1488                 echo '')
1489
1490         @echo 'Userspace tools targets:'
1491         @echo '  use "make tools/help"'
1492         @echo '  or  "cd tools; make help"'
1493         @echo  ''
1494         @echo  'Kernel packaging:'
1495         @$(MAKE) $(build)=$(package-dir) help
1496         @echo  ''
1497         @echo  'Documentation targets:'
1498         @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1499         @echo  ''
1500         @echo  'Architecture specific targets ($(SRCARCH)):'
1501         @$(if $(archhelp),$(archhelp),\
1502                 echo '  No architecture specific help defined for $(SRCARCH)')
1503         @echo  ''
1504         @$(if $(boards), \
1505                 $(foreach b, $(boards), \
1506                 printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1507                 echo '')
1508         @$(if $(board-dirs), \
1509                 $(foreach b, $(board-dirs), \
1510                 printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1511                 printf "  %-16s - Show all of the above\\n" help-boards; \
1512                 echo '')
1513
1514         @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1515         @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1516         @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1517         @echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1518         @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1519         @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1520         @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1521         @echo  '                1: warnings which may be relevant and do not occur too often'
1522         @echo  '                2: warnings which occur quite often but may still be relevant'
1523         @echo  '                3: more obscure warnings, can most likely be ignored'
1524         @echo  '                Multiple levels can be combined with W=12 or W=123'
1525         @echo  ''
1526         @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1527         @echo  'For further info see the ./README file'
1528
1529
1530 help-board-dirs := $(addprefix help-,$(board-dirs))
1531
1532 help-boards: $(help-board-dirs)
1533
1534 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1535
1536 $(help-board-dirs): help-%:
1537         @echo  'Architecture specific targets ($(SRCARCH) $*):'
1538         @$(if $(boards-per-dir), \
1539                 $(foreach b, $(boards-per-dir), \
1540                 printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1541                 echo '')
1542
1543
1544 # Documentation targets
1545 # ---------------------------------------------------------------------------
1546 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1547                linkcheckdocs dochelp refcheckdocs
1548 PHONY += $(DOC_TARGETS)
1549 $(DOC_TARGETS): scripts_basic FORCE
1550         $(Q)$(MAKE) $(build)=Documentation $@
1551
1552 # Misc
1553 # ---------------------------------------------------------------------------
1554
1555 PHONY += scripts_gdb
1556 scripts_gdb: prepare
1557         $(Q)$(MAKE) $(build)=scripts/gdb
1558         $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1559
1560 ifdef CONFIG_GDB_SCRIPTS
1561 all: scripts_gdb
1562 endif
1563
1564 else # KBUILD_EXTMOD
1565
1566 ###
1567 # External module support.
1568 # When building external modules the kernel used as basis is considered
1569 # read-only, and no consistency checks are made and the make
1570 # system is not used on the basis kernel. If updates are required
1571 # in the basis kernel ordinary make commands (without M=...) must
1572 # be used.
1573 #
1574 # The following are the only valid targets when building external
1575 # modules.
1576 # make M=dir clean     Delete all automatically generated files
1577 # make M=dir modules   Make all modules in specified dir
1578 # make M=dir           Same as 'make M=dir modules'
1579 # make M=dir modules_install
1580 #                      Install the modules built in the module directory
1581 #                      Assumes install directory is already created
1582
1583 # We are always building modules
1584 KBUILD_MODULES := 1
1585
1586 PHONY += $(objtree)/Module.symvers
1587 $(objtree)/Module.symvers:
1588         @test -e $(objtree)/Module.symvers || ( \
1589         echo; \
1590         echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1591         echo "           is missing; modules will have no dependencies and modversions."; \
1592         echo )
1593
1594 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1595 PHONY += $(module-dirs) modules
1596 $(module-dirs): prepare $(objtree)/Module.symvers
1597         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1598
1599 modules: $(module-dirs)
1600         @$(kecho) '  Building modules, stage 2.';
1601         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1602
1603 PHONY += modules_install
1604 modules_install: _emodinst_ _emodinst_post
1605
1606 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1607 PHONY += _emodinst_
1608 _emodinst_:
1609         $(Q)mkdir -p $(MODLIB)/$(install-dir)
1610         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1611
1612 PHONY += _emodinst_post
1613 _emodinst_post: _emodinst_
1614         $(call cmd,depmod)
1615
1616 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1617
1618 PHONY += $(clean-dirs) clean
1619 $(clean-dirs):
1620         $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1621
1622 clean:  rm-dirs := $(MODVERDIR)
1623 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1624
1625 PHONY += help
1626 help:
1627         @echo  '  Building external modules.'
1628         @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1629         @echo  ''
1630         @echo  '  modules         - default target, build the module(s)'
1631         @echo  '  modules_install - install the module'
1632         @echo  '  clean           - remove generated files in module directory only'
1633         @echo  ''
1634
1635 PHONY += prepare
1636 prepare:
1637         $(cmd_crmodverdir)
1638 endif # KBUILD_EXTMOD
1639
1640 clean: $(clean-dirs)
1641         $(call cmd,rmdirs)
1642         $(call cmd,rmfiles)
1643         @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1644                 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1645                 -o -name '*.ko.*' \
1646                 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1647                 -o -name '*.dwo' -o -name '*.lst' \
1648                 -o -name '*.su'  \
1649                 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1650                 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1651                 -o -name '*.asn1.[ch]' \
1652                 -o -name '*.symtypes' -o -name 'modules.order' \
1653                 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1654                 -o -name '*.c.[012]*.*' \
1655                 -o -name '*.ll' \
1656                 -o -name '*.gcno' \) -type f -print | xargs rm -f
1657
1658 # Generate tags for editors
1659 # ---------------------------------------------------------------------------
1660 quiet_cmd_tags = GEN     $@
1661       cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1662
1663 tags TAGS cscope gtags: FORCE
1664         $(call cmd,tags)
1665
1666 # Scripts to check various things for consistency
1667 # ---------------------------------------------------------------------------
1668
1669 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1670
1671 includecheck:
1672         find $(srctree)/* $(RCS_FIND_IGNORE) \
1673                 -name '*.[hcS]' -type f -print | sort \
1674                 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1675
1676 versioncheck:
1677         find $(srctree)/* $(RCS_FIND_IGNORE) \
1678                 -name '*.[hcS]' -type f -print | sort \
1679                 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1680
1681 coccicheck:
1682         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1683
1684 namespacecheck:
1685         $(PERL) $(srctree)/scripts/namespace.pl
1686
1687 export_report:
1688         $(PERL) $(srctree)/scripts/export_report.pl
1689
1690 PHONY += checkstack kernelrelease kernelversion image_name
1691
1692 # UML needs a little special treatment here.  It wants to use the host
1693 # toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1694 # else wants $(ARCH), including people doing cross-builds, which means
1695 # that $(SUBARCH) doesn't work here.
1696 ifeq ($(ARCH), um)
1697 CHECKSTACK_ARCH := $(SUBARCH)
1698 else
1699 CHECKSTACK_ARCH := $(ARCH)
1700 endif
1701 checkstack:
1702         $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1703         $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1704
1705 kernelrelease:
1706         @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1707
1708 kernelversion:
1709         @echo $(KERNELVERSION)
1710
1711 image_name:
1712         @echo $(KBUILD_IMAGE)
1713
1714 # Clear a bunch of variables before executing the submake
1715
1716 ifeq ($(quiet),silent_)
1717 tools_silent=s
1718 endif
1719
1720 tools/: FORCE
1721         $(Q)mkdir -p $(objtree)/tools
1722         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1723
1724 tools/%: FORCE
1725         $(Q)mkdir -p $(objtree)/tools
1726         $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1727
1728 # Single targets
1729 # ---------------------------------------------------------------------------
1730 # Single targets are compatible with:
1731 # - build with mixed source and output
1732 # - build with separate output dir 'make O=...'
1733 # - external modules
1734 #
1735 #  target-dir => where to store outputfile
1736 #  build-dir  => directory in kernel source tree to use
1737
1738 build-target = $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD)/)$@
1739 build-dir = $(patsubst %/,%,$(dir $(build-target)))
1740
1741 %.i: prepare FORCE
1742         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1743 %.ll: prepare FORCE
1744         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1745 %.lst: prepare FORCE
1746         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1747 %.o: prepare FORCE
1748         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1749 %.s: prepare FORCE
1750         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1751 %.symtypes: prepare FORCE
1752         $(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
1753 %.ko: %.o
1754         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1755
1756 # Modules
1757 PHONY += /
1758 /: ./
1759
1760 # Make sure the latest headers are built for Documentation
1761 Documentation/ samples/: headers_install
1762 %/: prepare FORCE
1763         $(Q)$(MAKE) KBUILD_MODULES=1 $(build)=$(build-dir)
1764
1765 # FIXME Should go into a make.lib or something
1766 # ===========================================================================
1767
1768 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1769       cmd_rmdirs = rm -rf $(rm-dirs)
1770
1771 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1772       cmd_rmfiles = rm -f $(rm-files)
1773
1774 # Run depmod only if we have System.map and depmod is executable
1775 quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1776       cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1777                    $(KERNELRELEASE)
1778
1779 # Create temporary dir for module support files
1780 # clean it up only when building all modules
1781 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1782                   $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1783
1784 # read saved command lines for existing targets
1785 existing-targets := $(wildcard $(sort $(targets)))
1786
1787 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1788
1789 endif   # ifeq ($(config-targets),1)
1790 endif   # ifeq ($(mixed-targets),1)
1791 endif   # need-sub-make
1792
1793 PHONY += FORCE
1794 FORCE:
1795
1796 # Declare the contents of the PHONY variable as phony.  We keep that
1797 # information in a variable so we can use it in if_changed and friends.
1798 .PHONY: $(PHONY)